Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/12—Polymerisation in non-solvents
  • C08F2/16—Aqueous medium
  • C08F2/18—Suspension polymerisation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F212/02—Monomers containing only one unsaturated aliphatic radical
  • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F212/06—Hydrocarbons
  • C08F212/08—Styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
  • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
  • C08F222/10—Esters
  • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
  • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
  • C08F222/10—Esters
  • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
  • C08F222/102—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate

Definitions

• the present invention relates to processes for the preparation of bead polymers having an average particle size in the range of 1 .mu.m to 40 .mu.m, in which dispersing and polymerizing a polymerizable composition in the aqueous phase. Furthermore, molding compositions and moldings are the subject matter of the present invention which comprise the bead polymers prepared according to the invention.
• bead polymers are required whose particle diameter is on the order of between 1 .mu.m and 40 .mu.m with a relatively narrow particle size distribution. These beads can u.a. be used as additives for PMMA molding compounds.
• the light-scattering molding compositions are to be regarded as an application field.
• standard molding compounds are mixed with so-called scattering beads, which are crosslinked and have a different refractive index than the matrix.
• PMMA-based scattering particles having a particle size well in excess of 40 ⁇ m are used in these molding compositions.
• the advantage of this scattering particles lies in the high forward scattering of the moldings after incorporation of the scattering particles into the molding compositions.
• opacifiers such as, for example, BaSO 4 or TiO 2 , since the loss due to backscattering is lower.
• This preferred forward scattering can be measured by measuring the transmission in combination with the Energy half-value angle or intensity half-value angle of moldings containing scattering beads can be determined.
• the smaller the particle size of the scattering beads the higher the scattering effect at the same weight fraction in the molding composition. By using smaller beads, therefore, their amount can be reduced. This saves costs and saves resources. Furthermore, the molding compositions provided with the smaller bead polymers show excellent mechanical properties, since the reduced amount of scattering beads has less influence on these properties. If scattered beads with a diameter smaller than 5 ⁇ m are used, the yellow impression of the molding compositions thus produced increases significantly.
• the above-described beads can also be used for matted molding compounds and polyalkyl (meth) acrylate (PAMA) plastisols.
• PAMA polyalkyl acrylate
• Polymer particles of the order of magnitude of between 1 ⁇ m and 10 ⁇ m can be easily produced by a precipitation polymerization in which large amounts of organic solvents are used.
• the solvents used are safety and waste technology not easy to handle.
• the work-up also causes problems. Therefore, beads thus obtained are expensive and are not used in the application areas set out above for reasons of cost.
• Polymer beads can be obtained more cost-effectively by conventional suspension polymerization. However, the particles thus obtained are generally greater than 40 microns and show a broad distribution.
• the polymer particles can according to the EP 0 443 609 A2 especially in the powder manufacturing industry.
• they are not suitable because the uncrosslinked polymer particles would dissolve in the molding composition to be produced and would thus be ineffective as light scattering particles.
• the publication DE 100 65 501 A1 discloses a process for the preparation of bead polymers having an average particle size in the range of 1 micron to 40 microns, in which a polymerizable composition having at least 50 wt.% Of (meth) acrylates, dispersed in aqueous phase and polymerized.
• the dispersion stabilized with an aluminum compound is prepared at a shear rate ⁇ 10 3 s -1 .
• the resulting bead polymers are u. a. used for the production of moldings with a matt surface, wherein the moldings shown in the examples have a transmission according to DIN 5036 in the range of 76.3 to 91.1, a yellowness value according to DIN 6167 in the range of 2.9 to 9.4 and an energy half-value angle ranging from 18.5 to 22.5. For many applications, however, a higher scattering effect is desirable.
• the present invention provides the process for preparing the bead polymers, the bead polymers, the molding compositions comprising the bead polymers and the molded articles obtainable from the molding compositions.
• Particularly expedient modifications of the process, the bead polymers, the molding compositions and the moldings are described in the respective dependent subclaims.
• the bead polymers to be produced in the context of the present invention have an average particle size in the range from 1 .mu.m to 40 .mu.m, preferably in the range from 5 .mu.m to 35 .mu.m.
• the particle size refers to the particle diameter. This value can be determined, for example, by laser extinction methods. For this purpose, a CIS particle analyzer The company LOT GmbH are used, wherein the measuring method for determining the particle size is included in the user manual. This method is preferred.
• the particle size can be determined by measuring and counting the particles on corresponding scanning electron micrographs.
• Particular embodiments of the bead polymers prepared according to the invention show a narrow size distribution. Particularly preferred is the standard deviation of the average particle diameter ⁇ 30 microns most preferably ⁇ 20 microns and in particular ⁇ 10 microns.
• spherical or spherical bead polymers are prepared which do not or only to a small extent coagulate, aggregate or store together.
• the radical 1 R is hydrogen or a linear or branched alkyl group having 1 to 6 carbon atoms, preferably hydrogen, methyl or ethyl, in particular hydrogen.
• the radicals 2 R to 6 R are each, independently of one another, hydrogen, a linear or branched alkyl group having 1 to 6 carbon atoms or a halogen.
• Particularly preferred alkyl groups have 1 to 4 carbon atoms, suitably 1 or 2 carbon atoms, in particular 1 carbon atom, and include in particular methyl, ethyl and iso-propyl.
• halogens chlorine and bromine are particularly preferred.
• all radicals 2 R to 6 R are hydrogen.
• the radical R is hydrogen or methyl.
• the radical R 7 denotes a linear or branched alkyl or an optionally alkylated cycloalkyl group having 1 to 40, preferably 1 to 24, suitably 1 to 12, particularly preferably 1 to 6, in particular 1 to 4, carbon atoms.
• radicals 8 R and 9 R are each independently of one another hydrogen or a group of the formula --COOR ', in which R' is hydrogen or an alkyl group having 1 to 40, preferably 1 to 24, advantageously 1 to 12, particularly preferably 1 to 6, in particular 1 to 4, carbon atoms.
• particularly advantageous compound of formula (I) include in particular styrene, substituted styrenes having an alkyl substituent in the side chain, such as. B. a-methylstyrene and a-ethylstyrene, substituted styrenes having an alkyl substituent on the ring, such as vinyltoluene and p-methylstyrene, halogenated styrenes, such as monochlorostyrenes, dichlorostyrenes, tribromostyrenes and tetrabromostyrenes.
• Particularly preferred compounds of the formula (II) include, in particular, (meth) acrylates, fumarates and maleates derived from saturated alcohols, for example methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, iso-propyl (meth) acrylate, n-butyl (meth) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, heptyl (meth) acrylate , 2-tert-butylheptyl (meth) acrylate, octyl (meth) acrylate, 3-iso-propytheptyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, undecyl
• the ester compounds with a long-chain alcohol radical in particular the compounds alcohol radicals with 6 or more carbon atoms, can be obtained, for example, by reacting (meth) acrylates, fumarates, maleates and / or the corresponding acids with long-chain fatty alcohols, generally a mixture of esters, such as For example, (meth) acrylates with different long-chain alcohol radicals formed.
• fatty alcohols include, among others, Oxo Alcohol® 7911, Oxo Alcohol® 7900, Oxo Alcohol® 1100, Alfol® 610, Alfol® 810, Lial® 125, and Nafol® grades (Sasol Olefins & Surfactants GmbH); Alphanol® 79 (ICI); Epal® 610 and Epal® 810 (Ethyl Corporation); Linevol® 79, Linevol® 911 and Neodol® 25E (Shell AG); Dehydad®, Hydrenol® and Lorol® types (Cognis); Acropol® 35 and Exxal® 10 (Exxon Chemicals GmbH); Kalcol 2465 (Kao Chemicals).
• the (meth) acrylates are particularly preferred over the maleates and fumarates, ie R 8 and R 9 represent hydrogen in particularly preferred embodiments.
• the methacrylates are preferred over the acrylates.
• (meth) acrylate in the context of the present invention comprises methacrylates and acrylates and mixtures of both.
• preferred mixtures for preparing preferred bead polymers may in particular comprise ethylenically unsaturated monomers which can be copolymerized with the compounds of the formulas (I) and / or (II).
• the proportion of comonomers is preferably in the range of 0.01 to 25.0 wt .-%, preferably in the range of 0.01 to 10.0 wt .-%, particularly preferably in the range of 0.01 to 5.0 wt .-%, in particular in the range of 0.01 to 1.0 wt .-%, based on the total weight of the monomer composition.
• comonomers for the polymerization according to the present invention are particularly suitable, which correspond to the formula: wherein R 1 * and R 2 * are independently selected from the group consisting of hydrogen, halogens, CN, linear or branched alkyl groups having 1 to 20, preferably 1 to 6 and particularly preferably 1 to 4 carbon atoms, which are substituted with 1 to (2n + 1) halogen atoms may be substituted, wherein n is the number of carbon atoms of the alkyl group (for example CF 3 ), cycloalkyl groups having 3 to 8 carbon atoms, which may be substituted by 1 to (2n-1) halogen atoms, preferably chlorine, where n is the Number of carbon atoms of the cycloalkyl group is; Aryl groups of 6 to 24 carbon atoms which may be substituted with 1 to (2n-1) halogen atoms, preferably chlorine, and / or alkyl groups of 1 to 6 carbon atoms, where n is the number of carbon atom
• the polymerization is generally started with known free-radical initiators.
• the preferred initiators include the azo initiators well known in the art, such as AIBN and 1,1-azobiscyclohexanecarbonitrile, and peroxy compounds such as methyl ethyl ketone peroxide, acetylacetone peroxide, dilauryl peroxide, tert-butyl per-2-ethylhexanoate, ketone peroxide, methyl isobutyl ketone peroxide, cyclohexanone peroxide, dibenzoyl peroxide , tert-butyl peroxybenzoate, tert-butyl peroxyisopropyl carbonate, 2,5-bis (2-ethylhexanoylperoxy) -2,5-dimethylhexane, tert-butylperoxy-2-ethylhexanoate, tert-butylperoxy-3,5,5- trimethyl
• These compounds are often used in an amount of 0.1 to 10.0 wt .-%, preferably from 0.5 to 3.0 wt .-%, based on the total weight of the monomers.
• the ratio of water to monomer is usually in the range from 0.4: 1 to 20: 1, preferably from 2: 1 to 8: 1, based on the weight of the components.
• aluminum compounds which are sparingly soluble in water is necessary. These include in particular aluminum oxide Al 2 O 3 and aluminum hydroxide Al (OH) 3 , Al (OH) 3 being preferred.
• aluminum hydroxide produced by precipitation which precipitation should be as short as possible before formation of the dispersion. In particular embodiments of the method according to the invention, the precipitation takes place within 2 hours, preferably within 1 hour and most preferably within 30 minutes before formation of the dispersion.
• Al 2 (SO 4 ) 3 can be dissolved in water. This solution can then be treated with a sodium carbonate solution until the pH is in the range of 5 to 5.5. By doing so, a colloidal distribution of the aluminum compound in the water is obtained, which is particularly preferred.
• the aluminum compound is preferably in an amount of 0.5 to 200.0 wt .-%, more preferably 3.0 to 100.0 wt .-% and most preferably 4.0 to 20.0 wt .-%, based on the total weight of the monomers used.
• the aluminum compound is preferably in an amount of 0.5 to 200.0 wt .-%, more preferably 3.0 to 100.0 wt .-% and most preferably 4.0 to 20.0 wt .-%, based on the total weight of the monomers used.
• auxiliaries for stabilization include in particular surface-active substances, such as, for example, anionic, cationic and neutral emulsifiers.
• Anionic emulsifiers are e.g. Alkali metal salts of higher fatty acids having 8 to 30 carbon atoms such as palmitic, stearic and oleic acid, alkali metal salts of sulfonic acids having for example 8 to 30 carbon atoms, especially sodium salts of alkyl or arylalkylsulfonic acids, alkali metal salts of half esters of phthalic acid, and alkali metal salts of resin acids such as abitic acid ,
• Cationic emulsifiers include salts of long-chain, in particular unsaturated, amines having from 10 to 20 carbon atoms, or quaternary ammonium compounds having longer-chain olefin or paraffin radicals.
• Neutral emulsifiers are e.g. ethoxylated fatty alcohols, ethoxylated fatty acids and ethoxylated phenols and fatty acid esters of polyhydric alcohols such as pentaerythritol or sorbitol.
• the aforementioned emulsifiers are preferably used in the range of 0.0 to 5.0 wt .-%, particularly preferably from 0.3 to 3.0 wt .-%, based on the weight of the aluminum compound.
• additives and auxiliaries may be added to the mixture before, during or after formation of the dispersion.
• additives and auxiliaries include in particular substances which impart certain properties to the particles, such as polymers, dyes and pigments, which optionally have ferromagnetic properties.
• chelating agents such as EDTA or Trilon A, and compounds which inhibit boiler scale formation such as polyethylene glycol can be used.
• the dispersion takes place at a shear rate ⁇ 10 3 s -1 .
• the shear rate is in the range of 10 4 s -1 to 10 5 s -1 .
• the particle size of the resulting bead polymer is greater than 40 microns.
• the shear rate can be defined as the value obtained by dividing the absolute value of the velocity difference of two levels by the distance between the two levels, the mixture to be dispersed being in the space between the two levels a short distance from one another to 6 mm, is located.
• the dispersion can be prepared by any suitable method.
• dispersants which are known to the person skilled in the art are used for this purpose. These include, inter alia, Dispermat, Fa. VMA Getzmann, Reichshof; Ultra-Turrax, Messrs. Janke and Kunkel, Staufen and Druckhomogenisator, Fa. Gaulin, Lübeck.
• devices with a rotor-stator system are known, such as Dispax, Fa. Janke and Kunkel, Staufen; Cavitron homogenizers, V. Hagen & Funke, Sprochhövel; Homogenizers from Kotthoff, Essen and homogenizers from Doee Oliver, Grevenbroich.
• these devices are operated at speeds of 1000 to 25000 min -1 , preferably 2000 to 25000 min -1 .
• the high shear forces required to form the dispersion can also be achieved by the action of ultrasonication, forcing the mixture to be dispersed under high pressure through a narrow gap or through small diameter nozzles, and using colloid mills.
• the dispersion of the monomers and the other constituents of the reaction mixture generally takes place at temperatures in the range of 0 to 100 ° C, preferably in the range of 20 to 60 ° C instead, without being limited thereto.
• the dispersion time can vary widely depending on the desired diameter of the monomer droplets, on the size distribution to be set and on the proportions of the constituents of the mixture. In general, the dispersion can be prepared within a few hours.
• the dispersion is generally carried out before the beginning of the polymerization. However, especially at the beginning of the polymerization, a high shear force can act on the dispersion in order to avoid possible formation of larger aggregates. On the other hand, the polymerization should take place soon after formation of the dispersion. Surprisingly, however, it has been found that the dispersion stabilized by the aluminum compound is stable over a relatively long period of time. This feature facilitates the use of conventional polymerization equipment since, unlike many conventional processes, no shear forces are required at the beginning of the polymerization.
• the polymerization can be carried out at atmospheric pressure, underpressure or overpressure.
• the polymerization temperature is not critical. However, depending on the initiator system used, it is generally in the range of 0 ° - 200 ° C, preferably 40 ° - 130 ° C and particularly preferably 60 ° - 120 ° C, without this being a limitation.
• the aluminum compound may be converted into a water-soluble form, for example, by adding sulfuric or hydrochloric acid.
• the bead polymer can be separated from the water by filtration under pressure without any problems occur. If known organic compounds are used instead of the aluminum compound essential for the invention to stabilize the dispersion, such a filtration is not possible due to the rheological properties of the mixture.
• Suitable matrix polymers are all thermoplastically processable polymers known for this purpose. These include, but are not limited to, polyalkyl (meth) acrylates such as polymethyl methacrylate (PMMA), polyacrylonitriles, polystyrenes, polyethers, polyesters, polycarbonates, polyvinyl chlorides. Here, polyalkyl (meth) acrylates are preferred. These polymers can be used individually or as a mixture. Furthermore, these polymers may also be in the form of copolymers.
• PMMA polymethyl methacrylate
• PMMA polyacrylonitriles
• polystyrenes polyethers
• polyesters polycarbonates
• polyvinyl chlorides polyvinyl chlorides
• polyalkyl (meth) acrylates are preferred.
• These polymers can be used individually or as a mixture. Furthermore, these polymers may also be in the form of copolymers.
• the refractive indices of the matrix polymer and of the bead polymer are expediently different from one another and preferably have a difference of at least 0.02.
• the content of the bead polymer, based on the total weight of the molding composition, is advantageously 0.1% by weight to 20.0% by weight, preferably 1.0% by weight to 15.0% by weight, advantageously 3, 0 wt .-% to 10.0 wt .-%, in particular 4.0 to 8.0 wt .-%.
• the molding compositions may contain conventional additives of all kinds. These include, but are not limited to, antistatics, antioxidants, mold release agents, flame retardants, lubricants, dyes, flow improvers, fillers, light stabilizers, and organic phosphorus compounds such as phosphites or phosphonates, pigments, weathering inhibitors, and plasticizers.
• the shaped articles favorably have a transmission in accordance with DIN 5036 greater than 40.0%, preferably greater than 45.0%, in particular greater than 50.0%.
• the intensity half-value angle ( ⁇ ) of the shaped bodies is preferably in the range from 35.0 ° to less than 90.0 °, preferably in the range from 50.0 ° to less than 90.0 °, in particular in the range from 72.0 ° to less than 90, 0 °.
• the moldings are advantageously characterized by a yellowness value according to DIN 6167 less than 10.0%, preferably less than 9.5%, in particular less than 9.0%.
• an aluminum hydroxide Pickering stabilizer was used, which was prepared by precipitation from aluminum sulfate and sodium carbonate solution immediately before the beginning of the actual polymerization.
• 16 g of Al 2 (SO 4 ) 3 , 0.032 g of complexing agent (Trilon A) and 0.16 g of emulsifier (emulsifier K30 obtainable from Bayer AG, sodium salt of a C 15 paraffin sulfonate) were distilled in 0.8 l Water dissolved.
• the aqueous phase was transferred to a beaker.
• a monomer mixture having the composition shown in Table 1 and 4 g of dilauryl peroxide, 0.4 g of tert-butyl per-2-ethylhexanoate and 1.6 g of ammonium peroxodisulfate.
• This mixture was dispersed by means of a disperser (Ultra-Turrax S50N-G45MF, Janke and Kunkel, Staufen) for 15 minutes at 7,000 rpm.
• the reaction mixture was introduced into the reactor, which had been preheated to the corresponding reaction temperature of 90 ° C., and polymerized at about 90 ° C. (polymerization temperature) for 45 minutes (polymerization time) with stirring (600 rpm). This was followed by a post-reaction phase of 1 hour at about 85 ° C internal temperature. After cooling to 45 ° C, the stabilizer was converted by the addition of 50% sulfuric acid in water-soluble aluminum sulfate. For working up the beads, the resulting suspension was filtered through a commercial filter cloth and dried in a warming cabinet at 50 ° C for 24 hours.
• the size distribution was examined by laser extinction methods for their mean size V 50 and the associated standard deviation. The results are summarized in Table 1.
• the beads had a spherical shape, whereby no fibers could be detected. Coagulation did not occur.
• the preparation was carried out according to the polymerization specification for the scattering beads A, CF, except that indicated in Table 1 Monomer mixtures used and no Pickering stabilizer was added.
• the preparation was carried out essentially according to the polymerization specification for the scattering beads A, C-F, but in each case 200 times the amounts of the constituents were used. As a result, some technical changes had to be made.
• the precipitated Pikeringstabilisator was initially charged with monomers, initiator and additives in the reactor and then dispersed at a temperature of 40 ° C using a flow-through disperser (Dispax reactor, Fa. Janke and Kunkel). For this purpose, the mixture was cycled through the disperser for 30 minutes, wherein the dispersion was stirred within the reactor with a conventional stirrer at 150 U / min.
• the dispersion was heated to 80 ° C.
• the polymerization and workup was carried out according to the polymerization specification for the scattering beads A, C-F.
• the size distribution of the bead polymer thus obtained is also given in Table 1.
• a PMMA standard molding compound (PLEXIGLAS® 7N available from Röhm GmbH) was modified with the amounts of the scattering beads AH given in Table 2. From these molding materials test specimens were produced by injection molding with the dimensions 60 mm x 45 mm x 3 mm, where the transmission (T) according to DIN 5036, the yellowness (G) according to DIN 6167 and the intensity half-angle ( ⁇ ) measured according to DIN 5036 with A measuring device LMT goniometer measuring station GO-T-1500 of the company LMT, were determined.
• T transmission
• G yellowness
• ⁇ intensity half-angle
• Table 2 show that the scattering grains compounded in molding compositions prepared according to the method of the present invention (Examples 1 to 17) scatter the light very well without much energy loss.
• the scattered grains with a stryol content of 85 wt .-% show the highest scattering effect.
• scattering beads with a lower or higher styrene content also achieve a high intensity half-value angle, this decreases more rapidly with decreasing concentration of the scattering grains in the molding compound.

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